I would like to have the internal name for the artillery shell 100kt atomic warhead. Trying to write some "handy" console commands. :) Do you mind sharing please?

Yeah, no problem, the names generated by the warheads mod are of the form "weapontype-warhead", with valid weapon types being:

Base game:
shotgun-shell-birdshot
shotgun-shell-buckshot
shotgun-shell-slug

rounds-magazine
cannon-shell
small-rocket
big-rocket

artillery-shell
land-mine
capsule

Internal/utility:
warhead-util-projectile

Schall's:
autocannon-shell
cannon-shell-75
cannon-shell-88
cannon-shell-128
Schall-sniper-magazine

SE:
weapon-delivery-capsule

K2:
pistol-magazine
rifle-magazine
anti-material-rifle-magazine
railgun-shell
turret-rocket

Random other mods:
aai-ironclad-mortar
rampant-mortar

With the warheads in T-N being:
-atomic-0_1t
-atomic-0_5t
-atomic-2t
-atomic-4t
-atomic-8t
-atomic-20t
-atomic-500t
-atomic-1kt
-atomic-15kt

-atomic-2-stage-15kt
-atomic-2-stage-100kt
-atomic-2-stage-1Mt
-atomic-2-stage-5Mt
-atomic-2-stage-10Mt
-atomic-2-stage-50Mt
-atomic-2-stage-100Mt
-atomic-2-stage-1Gt

-thermobaric-1
-thermobaric-2
-thermobaric-3

So the 100kt artillery shell is:
"artillery-shell-atomic-2-stage-100kt"

The only exception to this is that "big-rocket-atomic-20t" is actually called "atomic-bomb" internally, to make T-N play nice with other mods.

Wow! Thank you! Great info. I will put this to good use!

No problem, if you need any other info, feel free to ask - I know this system can make some things relatively obscure compared to other mods.